Slide rings having a ledeburitic microstructure at the surface
a microstructure and surface technology, applied in the field of sliding rings, can solve the problems of high cost, high effort, and low thermal conductivity, and achieve the effect of greater hardness and wear resistan
Inactive Publication Date: 2019-07-09
FEDERAL MOGUL FRIEDBERG
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- Description
- Claims
- Application Information
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Benefits of technology
This patent describes a method for improving the performance of a slide ring made from grey cast iron. The surface of the slide ring is treated with energy-rich radiation to create a different microstructure from the rest of the ring. This results in a more durable and resistant surface. The treatment can create a transition zone with a hardened microstructure and free graphite, which can improve lubricity. The method involves heating the surface with a laser beam or other energy source and allowing it to cool to room temperature. The resulting microstructure has greater hardness and resistance to wear than untreated grey cast iron. This treatment can produce a pattern of regions with different microstructures on the surface. The method can also involve adding carbide forming elements to the cast iron material. Overall, this patent presents a technique for improving the performance of slide rings made from grey cast iron.
Problems solved by technology
However, it is a disadvantage here that both the casting of the material and also the subsequent mechanical processing is only possible with great effort and high costs.
Furthermore, these materials are very brittle, which can lead to fracture on impact load.
In addition, the thermal conductivity is normally low.
Method used
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Embodiment Construction
[0016]In FIG. 1 an example slide ring is shown in cross-section, which has a functional surface according to the invention. In this case, the functional surface is the sliding surface 4 of the ring, which lies against, and slides on the counter-surface during operation. In further examples, additional or alternative functional surfaces can be present according to the invention, for instance the contact surface between elastomers and the slide ring. The base material 2 of the ring can be, for example, a grey cast iron, for instance a cast iron with lamellar graphite (EN-GJL), vermicular graphite (EN-GJV) or spheroidal graphite (EN-GJS).
[0017]On the functional surface 4, the remelting region 6 can be seen in section, which can extend for example up to a depth of approximately 1.5 mm perpendicularly to the surfaces. In this region, the base material 2 was remelted by energy-rich radiation such as for instance a laser beam. The remelting of this zone 6 in the region close to the surface...
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Abstract
A slide ring includes a main body composed of grey cast iron, wherein at least a partial region of a functional surface has a ledeburitic microstructure at the surface. A method for producing such a slide ring includes heating a functional surface of the slide ring by irradiating with high-energy radiation, wherein the irradiation is carried out so that at least a partial region of the irradiated surface is remelted, wherein the parameters of the irradiation are selected so that at least a partial region of the functional surface has a ledeburitic microstructure after cooling.
Description
BACKGROUND OF THE INVENTION1. Technical Field[0001]The invention relates to slide rings having a functional surface of ledeburitic microstructure, and a method for producing such rings.2. Related Art[0002]Owing to the required wear resistance, metallic slide seal rings are often manufactured from material which is as hard and wear-resistant as possible. This includes, for example, ledeburitic chilled cast iron or cast steel with a high chromium content. These materials usually have a high-degree of hardness (between 50-64 HRC) and a very good wear resistance with respect to abrasion. However, it is a disadvantage here that both the casting of the material and also the subsequent mechanical processing is only possible with great effort and high costs. Furthermore, these materials are very brittle, which can lead to fracture on impact load. In addition, the thermal conductivity is normally low.[0003]In the production of cast iron, a differentiation is made between grey and white solid...
Claims
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IPC IPC(8): C21D1/09F16J15/34C22C33/08C22C33/04C21D9/40C21D5/00C21D1/34C21D1/38
CPCC21D9/40C21D1/34C21D1/38C21D5/00C22C33/04C22C33/08F16J15/3496C21D1/09C21D2251/04C21D2211/002C21D2211/004C21D2211/007C21D2211/008C21D2221/00C21D2221/10C21D2221/02
Inventor BRADL, CHRISTOPHMATZ, MARC-MANUELDENGLER, ANDREASKUMPFMULLER, ANDREAS
Owner FEDERAL MOGUL FRIEDBERG